0
Input Length
0
Output Length
0%
Compression Ratio
Invalid
Base64 Status
Base64 Encoder/Decoder
Base64 encoding and decoding tool with URL-safe mode and various configuration options.
Base64 Encoder/Decoder - Conversion Direction
Base64 Encoder/Decoder Tool Guide
Base64 Encoder/Decoder is a free online tool that can quickly perform Base64 encoding and decoding operations. Supports bidirectional conversion (encoding and decoding), URL-safe mode, auto-detection, strict mode, and various configuration options. Real-time conversion with instant results. Supports multiple character sets (UTF-8, ASCII, Latin-1) to flexibly handle various encoding needs. All processing is done locally in your browser, data is never uploaded to the server, completely protecting your privacy and data security.
Bidirectional conversion, supports encoding and decoding
100% local processing, privacy secure
Multiple configuration options, flexible for various needs
Tool Features
Bidirectional Encoding and Decoding
Supports both Base64 encoding and decoding operations, allowing quick conversion between text and Base64 strings. Encoding mode: Convert plain text to Base64 encoded strings, supports multiple character sets (UTF-8, ASCII, Latin-1). Decoding mode: Convert Base64 encoded strings back to original text, supports automatic detection of URL-safe mode, supports strict mode validation. Automatically converts after switching modes, no manual operation required.
Rich Configuration Options and Auto-Detection
Provides multiple configuration options to flexibly handle various use cases. URL-safe mode: Replace + and / in Base64 strings with - and _, remove padding =, suitable for URL transmission. Auto-detect: Automatically identify URL-safe Base64 strings and decode correctly. Strict mode: Strictly validate Base64 format during decoding to ensure data correctness. Character set selection: Supports UTF-8, ASCII, Latin-1 and other character sets to meet different encoding needs.
Detailed Statistics and Convenient Operations
Provides detailed statistics including input length, output length, compression ratio, Base64 validity, etc. Statistics are displayed in colorful cards, clear and intuitive. Supports one-click copy of output results, convenient for using results elsewhere. Supports swapping input and output data to quickly switch encoding/decoding direction. Supports clear function to quickly reset all content. All operations take effect in real-time, results update immediately after modifying input.
How to Use
- 1
Select Conversion Direction and Enter Data
First select the conversion direction: Encode (convert text to Base64) or Decode (convert Base64 to text). Then enter or paste the data you want to convert in the input area. If in encoding mode, enter plain text; if in decoding mode, enter Base64 encoded string. Conversion will be triggered automatically after input, no need to click any button.
- 2
Configure Conversion Options
Select the options you need in the conversion options area. Encoding mode options: URL-safe mode (generate URL-friendly Base64 strings). Decoding mode options: Strict mode (strictly validate Base64 format), Auto-detect (automatically identify URL-safe Base64). Common options: Character set selection (UTF-8, ASCII, Latin-1). Conversion results update immediately after selecting options.
- 3
View Statistics and Copy Results
After conversion is complete, you can view the statistics cards to see input length, output length, compression ratio, Base64 validity, etc. You can click the "Copy" button to copy the conversion result, or click the "Swap" button to quickly switch encoding/decoding direction, or click the "Clear" button to clear all content. The converted result will be displayed in the output area and can be used directly or copied elsewhere.
Frequently Asked Questions
What's the difference between URL-safe mode and normal mode?
URL-safe mode replaces + and / characters in Base64 strings with - and _, and removes padding character =, so the generated Base64 string can be used directly in URLs without causing URL parsing errors due to special characters. Normal mode uses standard Base64 character set (A-Z, a-z, 0-9, +, /) and padding character =, suitable for most scenarios. Both modes can be automatically detected and converted.
Will my data be uploaded to the server?
No, all processing is done in your browser. Your data never leaves your device, completely protecting your privacy.
What should I do if an error occurs during decoding?
If an error occurs during decoding, first check if the Base64 string is complete and correct. Common causes include: string is truncated, contains illegal characters, or is not a valid Base64 format. You can try enabling the "Auto-detect" option, the tool will automatically identify URL-safe Base64 strings. If it still fails, check if the original data is correct, or try enabling "Strict mode" to get more detailed error information.
Share This Tool
Share this useful tool with your friends and colleagues
Related Tools
URL Encoder/Decoder
URL encoding and decoding tool with various encoding types and configuration options.
URLEncode
UUID Generator
Generate various versions of UUIDs with multiple formats and configuration options.
UUIDGenerate
Regex Tester
Test and debug regular expressions with multiple flags and real-time matching results.
RegexTest